Are you looking for time frames ie. Engine hours? or specs? Ring gap, etc?
Generally you are looking at 50hrs - 100hrs for a 300. I did my first one at 75hrs. Ring gap was still middle of spec. Piston skirt was showing minimal wear. I did have some engine noise as revs fell which is why i went digging. It cleared up after new piston. I wouldn't be doing it before 75hrs and I tend to show the bike lots of revs. If you lug alot 100hrs easy.
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